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system time
Greenwich Mean Time
Local Aircraft Time
(in feet unless --units-meters specified)
multiple instances can be used
File
Save Flight
Load Flight
Reset
Hires Snap Shot
Snap Shot
Print
Exit
View
Toggle Panel
Pilot Offset
HUD Alpha
Properties
Presets
New Airport
New Runway
Set Offset Distance
Set Altitude
Set Glideslope (degrees)
Set Airspeed (kts)
Commit Changes
Autopilot
Set Heading
Set Altitude
Add Waypoint
Skip Current Waypoint
Clear Route
Adjust AP Settings
Toggle HUD Format
Help
fgfs [ option ... ]
For a complete list of options use --help --verbose
General Options
Show the most relevant command line options
Show all command line options when combined with --help or -h
Display the current FlightGear version
Specify the root data path
Specify the scenery path(s);
Defaults to $FG_ROOT/Scenery
Specify additional aircraft directory path(s)
Select the language for this session
Disable full-screen game mode
Enable full-screen game mode
Disable splash screen
Enable splash screen
Don't save preferences upon program exit
Allow saving preferences at program exit
Disable introduction music
Enable introduction music
Disable extra mouse pointer
Enable extra mouse pointer
(i.e. for full screen Voodoo based cards)
Exclude random scenery objects
Include random scenery objects
Disable METAR based real weather fetching
Enable METAR based real weather fetching (this requires an open internet connection)
Pass a METAR to set up static weather
(buildings, etc.)
Deprecated option (disable internal AI subsystem)
Enable AI subsystem (required for multi-player, AI traffic and many other animations)
Disable artificial traffic.
Enable artificial traffic.
Disable all AI scenarios.
Add and enable a new scenario. Multiple options are allowed.
Start in a running state
Start in a frozen state
Fuel is consumed normally
Fuel tank quantity forced to remain constant
Clock advances normally
Do not advance clock
Primary control mode (joystick, keyboard, mouse)
Enable auto coordination
Disable auto coordination
Specify path to your web browser
Set property <name> to <value>. <type> can be one of string, double, float, long, int, or bool.
Load additional properties from path
Use feet for distances
Use meters for distances
Environment Options
Features
Disable Heads Up Display (HUD)
Enable Heads Up Display (HUD)
Disable instrument panel
Enable instrument panel
Disable anti-aliased HUD
Enable anti-aliased HUD
Disable 3D HUD
Enable 3D HUD
Aircraft
Select an aircraft profile as defined by a top level <name>-set.xml
Print a list of the currently available aircraft types
Allows you to define a minimum status level (=development status) for all listed aircraft
Select an vehicle profile as defined by a top level <name>-set.xml
Select aircraft livery
Flight Model
Select the core flight dynamics model
Can be one of jsb, larcsim, yasim, magic, balloon, ada, external, or null
Select aircraft aerodynamics model to load
Run the FDM this rate (iterations per second)
Run the FDM 'n' times faster than real time
Do NOT attempt to trim the model
(only with fdm=jsbsim)
Trim the model
(only with fdm=jsbsim)
Start at ground level (default)
Start in air (implied when using --altitude)
Specify wind coming from DIR (degrees) at SPEED (knots)
Set up random wind direction and speed
Specify turbulence from 0.0 (calm) to 1.0 (severe)
Create an overcast ceiling, optionally with a specific thickness (defaults to 2000 ft).
Aircraft directory relative to the path of the executable
Aircraft model directory (UIUC FDM ONLY)
Initial Position and Orientation
Specify starting position relative to an airport
Specify parking position at an airport (must also specify an airport)
Specify starting position on an AI carrier
Specify which starting position on an AI carrier (must also specify a carrier)
Specify starting position relative to a VOR
Specify starting position relative to an NDB
Specify starting position relative to a fix
Specify starting runway (must also specify an airport)
Specify distance to reference point (statute miles)
Specify heading to reference point
Starting longitude (west = -)
Starting latitude (south = -)
Starting altitude
Specify heading (yaw) angle (Psi)
Specify roll angle (Phi)
Specify pitch angle (Theta)
Specify velocity along the body X axis
Specify velocity along the body Y axis
Specify velocity along the body Z axis
Specify velocity along a South-North axis
Specify velocity along a West-East axis
Specify velocity along a vertical axis
Specify initial airspeed
Specify initial mach number
Specify flight path angle (can be positive)
Specify initial climb rate (can be negative)
Audio Options
Disable sound effects
Enable sound effects
Show a list of available audio device
Explicitly specify the audio device to use
Rendering Options
Specify the bits per pixel
Disable fog/haze
Enable fastest fog/haze
Enable nicest fog/haze
Disable celestial body growth illusion near the horizon
Enable celestial body growth illusion near the horizon
Disable enhanced runway lighting
Enable enhanced runway lighting
Disable runway light distance attenuation
Enable runway light distance attenuation
Disable specular reflections on textured objects
Enable specular reflections on textured objects
Enable 2D (flat) cloud layers
Disable 2D (flat) cloud layers
Enable 3D (volumetric) cloud layers
Disable 3D (volumetric) cloud layers
Specify field of view angle
Specify a multiplier for the aspect ratio.
Disable fullscreen mode
Enable fullscreen mode
Enable flat shading
Enable smooth shading
Disable sky blending
Enable sky blending
Disable textures
Enable textures
Anisotropic Texture Filtering: values should be 1 (default),2,4,8 or 16
Disable wireframe drawing mode
Enable wireframe drawing mode
Specify window geometry (640x480, etc)
Specify the default forward view direction as an offset from straight ahead. Allowable values are LEFT, RIGHT, CENTER, or a specific number in degrees
Specify initial visibility
Specify initial visibility in miles
Hud Options
Hud displays number of triangles rendered
Hud displays percentage of triangles culled
Time Options
Specify a time of day
Specify the startup season
Add this time offset
Synchronize time with real-world time
Synchronize time with local real-world time
Specify a starting date/time with respect to
Network Options
Enable http server on the specified port
Specify which proxy server (and port) to use. The username and password are optional and should be MD5 encoded already. This option is only useful when used in conjunction with the real-weather-fetch option.
Enable telnet server on the specified port
Enable screen shot http server on the specified port
Disable automatic scenery downloads/updates
Enable automatic scenery downloads/updates
Set target directory for scenery downloads
MultiPlayer Options
Specify multipilot communication settings
assign a unique name to a player
Route/Way Point Options
Specify a waypoint for the GC autopilot;
Read all waypoints from a file
IO Options
Emit the Garmin AV400 protocol required to drive a Garmin 196/296 series GPS
Emit the set of AV400 strings required to drive a Garmin 400-series GPS from FlightGear
Open connection using the Atlas protocol
Open connection using the ATC sim protocol (atc610x)
Open connection using the Garmin GPS protocol
Open connection to an Agwagon joystick
Open connection to a remote joystick
Open connection using the FG Native Controls protocol
Open connection using the FG Native FDM protocol
Open connection using the FG Native GUI protocol
Open connection using the FG Native protocol
Open connection using the NMEA protocol
Open connection using a predefined communication interface and a preselected communication protocol
Open connection using the OpenGC protocol
Open connection using the interactive property manager
Open connection using the PVE protocol
Open connection using the Ray Woodworth motion chair protocol
Open connection using the RUL protocol
Avionics Options
Set the COM1 radio frequency
Set the COM2 radio frequency
Set the NAV1 radio frequency, optionally preceded by a radial.
Set the NAV2 radio frequency, optionally preceded by a radial.
Set the ADF1 radio frequency, optionally preceded by a card rotation.
Set the ADF2 radio frequency, optionally preceded by a card rotation.
Slave the ADF to one of the NAV radios, or set its internal frequency.
Situation Options
Fail the pitot, static, vacuum, or electrical system (repeat the option for multiple system failures).
Debugging Options
Abort on encountering a floating point exception;
Use a model viewer rather than load the entire simulator;
Trace the reads for a property;
Trace the writes for a property;
Specify which logging level to use